| http://www.w3.org/ns/prov#value | - Air quality is also very poor in these crowded conditions, with build-up of aerial pollutants such as dust and pathogens, and noxious gases including ammonia, methane, carbon dioxide, and nitrous oxide. (8) Constant exposure to these pollutants and high ammonia levels is associated with a number of health problems in birds, including painful respiratory tract disorders, keratoconjunctivitis (swell
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